Who am I? Weibo:

Transcription

1 Nodejs Javascript

2 Who am I? Weibo:

3 1. Hello world Nodejs Hello world 2. String = Buffer => Stream String Buffer, Buffer Stream Javascript Socket HTTP 3. Javascript Nodejs 4. Nodejs npm

4 Hello world

5 Nodejs

6 Nodejs, Tornado, Go, Netty Nodejs: Tornado: Go: Netty:

7 Python: Tornado from tornado.ioloop import IOLoop from tornado.web import RequestHandler, \ Application class MainHandler(RequestHandler): def get(self): self.write("hello, world") application = Application([ (r"/", MainHandler), ]) if name == " main ": application.listen(8080) IOLoop.instance().start()

8 Go: package main import ( "http" "io" ) func handler(w http.responsewriter, r *http.request) { io.writestring(w, "Hello, world") } func main() { http.handlefunc("/", handler) http.listenandserve(":8080", nil) }

9 Java: Netty private void handlehttprequest( ChannelHandlerContext ctx, HttpRequest req) throws Exception { HttpResponse res = new DefaultHttpResponse(HTTP_1_1, OK); res.setheader(content_type, "text/html; charset=utf-8"); setcontentlength(res, 11); res.setcontent( ChannelBuffers.copiedBuffer( "hello world", CharsetUtil.US_ASCII)); sendhttpresponse(ctx, req, res); }

10 Nodejs: var http = require('http'); http.createserver(function(req, res){ res.end('hello, World'); }).listen(8080);

11 Nodejs: 4CPU var cluster = require('cluster'), http = require('http'); var server = http.createserver(function(req, res) { res.end('hello World'); }); cluster(server).set('workers', 4).use(cluster.stats()).listen(8080);

12 CPU $ cat /proc/cpuinfo grep name cut -f2 -d: uniq -c 8 Intel(R) Xeon(R) CPU 2.33GHz 16GB $ cat /etc/issue grep Linux Red Hat Enterprise Linux Server release 5.4 (Tikanga)

13 $ ab -c 30 -n Name 30 threads rps 100 rps 1000 rps 5000 rps Nodejs 7,287 7,038 6,786 6,912 Tornado 2,967 2,966 2,967 2,982 Go 5,214 5,157 5,080 5,164 Netty 13,526 13,351 11,332 7,921 Nodejs 4P 14,826 14,332 12,161 8,287

14 ** Nodejs **

15 String => Buffer => Stream

16 Javascript Javascript Unicode String TCP Javascript V8 1GB 1GB

17 Buffer Buffer V8 the V8 heap V8 1GB Buffer

18 Buffer // buffer.js var a = new Buffer(10); console.log(a, a.tostring()); var b = new Buffer('QCon2011 '); console.log(b, b.tostring()); $ node buffer.js <Buffer e 00 2f 0f e> '\u0005\bn\u0000/\u000f&\u0005\u0004n' <Buffer f 6e e6 9d ad e5 b7 9e> 'QCon2011 '

19 fs, net, http(s) var fs = require('fs') I/O POSIX var net = require('net') streams ( ) HTTP var http(s) = require('http[s]') Node HTTP HTTP

20 fs, net, http(s) fs var fs = require('fs'); // $ touch /tmp/hellosync fs.renamesync('/tmp/hellosync', '/tmp/worldsync'); var stats = fs.statsync('/tmp/worldsync'); console.log('statssync:' + JSON.stringify(stats));

21 fs, net, http(s) fs var fs = require('fs'); // $ touch /tmp/hello fs.rename('/tmp/hello', '/tmp/world', function (err) { if (err) throw err; fs.stat('/tmp/world', function (err, stats) { if (err) throw err; console.log('stats: ' + JSON.stringify(stats)); }); });

22 fs, net, http(s) telnet (1) // chat.js var net = require('net'); var clients = []; net.createserver(function(client) { client.write('enter your name:\n'); client.once('data', function(data) { var username = data.tostring().trim(); clients.push(client); broacast(username + ' : Join!\n'); client.on('data', function(data) { var text = username + ' : ' + data; broacast(text); }); }); }).listen(11021);

23 fs, net, http(s) telnet (2) // function broacast(text) { console.log(text.trim()); var i = 0, l = clients.length; for(; i < l; i++) { var c = clients[i]; c.write(text); } };

24 fs, net, http(s) telnet (3) Server: $ node chat.js mk2 : Join! mk2 : Hello qcon2011 hangzhou! Client: $ telnet xxx Enter your name: mk2 mk2 : Join! Hello qcon2011 hangzhou! mk2 : Hello qcon2011 hangzhou!

25 fs, net, http(s) http server var http = require('http'); http.createserver(function(req, res) { if(req.url === '/') { res.end('hello world'); } else { res.end('http ' + req.method + ' : ' + req.url); } }).listen(8080);

26 fs, net, http(s) http client var http = require('http'); var options = { host: ' port: 80, path: '/' }; http.get(options, function(res) { console.log("got response: " + res.statuscode); res.on('data', function(data) { console.log(data.tostring()); }); }).on('error', function(e) { console.log("got error: " + e.message); });

27 Stream: Stream HTTP request stdout EventEmitter (Pipe)

28 fs.readstream var readstream = fs.createreadstream(uploadfile); data read

29 fs.readstream readstream.on('data', function(chunk) { console.log('write', chunk.length); // req.write(chunk); }); end readstream.on('end', function() { req.end(); });

30 Pipe data end pipe pipe ==> req.end() readstream.pipe(req); readstream upload_file.js

31 Pipe :)

32 fs.writestream var writestream = fs.createwritestream(savefile); ==> res.pipe(writestream);

33 fs.writestream writestream.on('close', function() { callback(null, res); }); WriteStream download_file.js

34 Pipe

35 Javascript Nodejs......

36 Web... IO

37 Web job:

38

39 Trello: 3

40

41

42

43 PaintChat:

44

45

46 Instagram Real-time API Demo: Instagram Socket.io

47 Cloud9: Web IDE

48

49 : Nodefox Nodefox: MySQL

50

51 : Nodefox Nodefox

52 : Loggly Loggly: syslog HTTP Web

53

54 NAE Proxy: Node App Engine Http proxy socket

55 : TermKit TermKit: next gen terminal / command application, built out of WebKit and Node.js.

56

57 : TermKit

58

59 : nodejs GTK+ demo

60 Nodejs 1152

61 Web Database Templating CSS Engines CMS Build and Deployment Openssl, Hashing SMTP TCP/IP RPC Web Sockets & Ajax Message Queues Testing JSON XML Debugging Compression Graphics Payment Gateways API clients Control flow / Async goodies I18n and L10n modules

62 : npm

63 : npm npm nodejs nodejs mysql $ npm install mysql

64 (1) Middleware Connect HTTP server Web Express, webjs node-mysql, redis-node, node-mongoskin

65 (2) Web Sockets & Ajax, RPC Socket.io, nowjs nodeunit, expresso / EventProxy, Jscex, async

66 Node's goal easy Provide an way to build scalable network programs.

67 Q & A

68 next("thanks ^_^")